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In addition to rapid signaling, electrical activity provides important cues to developing neurons. Electrical activity relies on the function of several different types of voltage-gated ion channels. Whereas voltage-gated Ca2+ channel activity regulates several aspects of neuronal differentiation, much less is known about developmental roles of(More)
The presence of multiple Nav1 isotypes within a neuron and the lack of specific blockers hamper identification of the in vivo roles of sodium current (INa) components, especially during embryonic stages. To identify the functional properties of INa components in vivo in developing neurons, we took a molecular genetic approach. Embryonic zebrafish(More)
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder that, for approximately 80% of patients, is fatal within five years of diagnosis. To better understand ALS, animal models have been essential; however, only rodent models of ALS exhibit the major hallmarks of the disease. Here, we report the generation of transgenic zebrafish(More)
Although the zebrafish is increasingly used as a model organism to study epilepsy, no standard electrophysiological technique for recording electrographic seizures in adult fish exists. The purpose of this paper is to introduce a readily implementable technique for recording pentylenetetrazole seizures in the adult zebrafish. We find that we can(More)
Whereas it is known that voltage-gated calcium channels play important roles during development, potential embryonic roles of voltage-gated sodium channels have received much less attention. Voltage-gated sodium channels consist of pore-forming alpha-subunits (Na(v)1) and auxiliary beta-subunits. Here, we report the embryonic and larval expression patterns(More)
The actin-binding and bundling protein, plastin 3 (PLS3), was identified as a protective modifier of spinal muscular atrophy (SMA) in some patient populations and as a disease modifier in animal models of SMA. How it functions in this process, however, is not known. Because PLS3 is an actin-binding/bundling protein, we hypothesized it would likely act via(More)
Before a system of systems is deployed, it is tested-but it is tested against known operational mission, under several known operational scenarios. Once the system is deployed, new possible unexpected and/or uncertain operational scenarios emerge. It is desirable to develop methodologies to test the system against such scenarios. A possible methodology to(More)
Whereas Kvbeta2 subunits modulate potassium current properties carried by Kv1 channel complexes in heterologous systems, little is known about the contributions of Kvbeta2 subunits to native potassium channel function. Using antisense approaches and in situ recordings from Xenopus embryo spinal cord neurons, we tested the in vivo roles of Kvbeta2 subunits(More)
Within the developing Xenopus spinal cord, voltage-gated potassium (Kv) channel genes display different expression patterns, many of which occur in opposing dorsal-ventral gradients. Regional differences in Kv gene expression would predict different patterns of potassium current (I(Kv)) regulation. However, during the first 24 h of postmitotic(More)